Nidec/US Motors 1.0 HP [9.0A] [56Y/TB] Spa Motor (ASB503)

Type:	Pump Motors
Mfg	Nidec/US Motors
Mfg Part #	ASB503
Replaces:	389635
Works With:	Spa Motor
Phase:	1-Phase
Horsepower:	1.0 HP
Frame:	56Y Frame - Thru-Bolt
Speed:	2-Speed
Voltage:	230V
Amperage:	9.0A/3.3A
Mount:	Threaded

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TAGS: pumpmotors, usmotors

Details

The Nidec/US Motors 1.0 HP [9.0A] [56Y/TB] Spa Motor is a replacement spa pump motor built for applications that require the matching horsepower, frame style, amperage, and mounting configuration shown in the product title. Motor replacement should be handled carefully because even small differences in frame, shaft, voltage, speed, service factor, or through-bolt pattern can prevent proper installation or affect pump performance. This motor is intended for repair situations where the wet end or pump housing is still serviceable and only the motor side needs to be replaced. Always compare the existing motor nameplate, pump model, wiring configuration, and part number ASB503 before ordering or installation.

Replacement motor rated for 1.0 HP applications where specifications match
Used with compatible spa pump assemblies and wet ends
Helps restore pump operation when the original motor has failed or become unreliable
Confirm frame, voltage, amperage, speed, shaft, and mounting style before purchase
Use part number ASB503 along with the motor nameplate to verify fit

Nidec / U.S. Motors – Pool Pump Motors, Electric Motors and Replacement Motor Parts

Who is Nidec / U.S. Motors?

Nidec / U.S. Motors is a leading manufacturer of electric motors and drive systems, part of the global Nidec Corporation. With over a century of engineering expertise, U.S. Motors has become a trusted name in high-performance motor solutions used across HVAC, industrial, and pool and spa applications. Their motors are widely recognized for reliability, efficiency, and long service life.

What products does Nidec / U.S. Motors specialize in?

Nidec / U.S. Motors specializes in electric motors including pool pump motors, variable speed motors, single-speed motors, and replacement motor components. Their product lineup includes motors designed to power pumps, filtration systems, and water features, ensuring proper water circulation and system performance.

Why choose Nidec / U.S. Motors parts for your pool or spa?

Nidec / U.S. Motors products are known for durability, energy efficiency, and consistent performance. Their motors are engineered to operate in demanding environments, handling continuous use, high humidity, and temperature fluctuations. Pool professionals and homeowners choose Nidec for dependable motor replacements that improve efficiency and extend equipment life.

How do you identify and choose the correct Nidec / U.S. Motors part?

To select the correct motor, it’s important to match specifications such as horsepower (HP), service factor (SF), voltage, frame size, RPM, and shaft type. Verifying model numbers and compatibility with your existing pump ensures proper fit and operation. Choosing the right motor helps maintain efficient performance and prevents system damage.

Need help finding the right Nidec / U.S. Motors part?

At Bath & Spa Parts Online, we carry a wide selection of Nidec / U.S. Motors pool, spa, and bath parts ready to ship. Can’t find what you need? Contact our Product Specialists at 800-918-9143, use the live chat, or visit our Contact Us page. For installation guides, part diagrams, and troubleshooting resources, visit the Bath & Spa Parts Online Knowledge Base for expert support.